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I started working at a Ford dealership in about 1966 or so. They had what was called a 'Hot Tank' for cleaning engine blocks an such. It was a tank full of hot water and caustic soda (lye) Worked really well , kinda bit your nose when parts were removed and not nearly as dangerous as some other chemicals deemed less hazardous than lye. The same chemicals that have since been banned by the EPA .
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